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linux/drivers/usb/serial/mos7840.c
Donald Lee 093ea2d3a7 USB: serial: mos7840: Fixed MCS7820 device attach problem 
A MCS7820 device supports two serial ports and a MCS7840 device supports
four serial ports. Both devices use the same driver, but the attach function
in driver was unable to correctly handle the port numbers for MCS7820
device. This problem has been fixed in this patch and this fix has been
verified on x86 Linux kernel 3.2.9 with both MCS7820 and MCS7840 devices.

Signed-off-by: Donald Lee <donald@asix.com.tw>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-03-14 12:25:26 -07:00

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Clean ups from Moschip version and a few ioctl implementations by:
* Paul B Schroeder <pschroeder "at" uplogix "dot" com>
*
* Originally based on drivers/usb/serial/io_edgeport.c which is:
* Copyright (C) 2000 Inside Out Networks, All rights reserved.
* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
/*
* Version Information
*/
#define DRIVER_VERSION "1.3.2"
#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
/*
* 16C50 UART register defines
*/
#define LCR_BITS_5 0x00 /* 5 bits/char */
#define LCR_BITS_6 0x01 /* 6 bits/char */
#define LCR_BITS_7 0x02 /* 7 bits/char */
#define LCR_BITS_8 0x03 /* 8 bits/char */
#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
#define LCR_STOP_1 0x00 /* 1 stop bit */
#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
#define LCR_PAR_NONE 0x00 /* No parity */
#define LCR_PAR_ODD 0x08 /* Odd parity */
#define LCR_PAR_EVEN 0x18 /* Even parity */
#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
#define LCR_PAR_MASK 0x38 /* Mask for parity field */
#define LCR_SET_BREAK 0x40 /* Set Break condition */
#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
#define MCR_DTR 0x01 /* Assert DTR */
#define MCR_RTS 0x02 /* Assert RTS */
#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
#define MOS7840_MSR_RI 0x40 /* Current state of RI */
#define MOS7840_MSR_CD 0x80 /* Current state of CD */
/*
* Defines used for sending commands to port
*/
#define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
#define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
#define MOS_PORT1 0x0200
#define MOS_PORT2 0x0300
#define MOS_VENREG 0x0000
#define MOS_MAX_PORT 0x02
#define MOS_WRITE 0x0E
#define MOS_READ 0x0D
/* Requests */
#define MCS_RD_RTYPE 0xC0
#define MCS_WR_RTYPE 0x40
#define MCS_RDREQ 0x0D
#define MCS_WRREQ 0x0E
#define MCS_CTRL_TIMEOUT 500
#define VENDOR_READ_LENGTH (0x01)
#define MAX_NAME_LEN 64
#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
/* For higher baud Rates use TIOCEXBAUD */
#define TIOCEXBAUD 0x5462
/* vendor id and device id defines */
/* The native mos7840/7820 component */
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7840 0x7840
#define MOSCHIP_DEVICE_ID_7820 0x7820
/* The native component can have its vendor/device id's overridden
* in vendor-specific implementations. Such devices can be handled
* by making a change here, in moschip_port_id_table, and in
* moschip_id_table_combined
*/
#define USB_VENDOR_ID_BANDB 0x0856
#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
/* This driver also supports
* ATEN UC2324 device using Moschip MCS7840
* ATEN UC2322 device using Moschip MCS7820
*/
#define USB_VENDOR_ID_ATENINTL 0x0557
#define ATENINTL_DEVICE_ID_UC2324 0x2011
#define ATENINTL_DEVICE_ID_UC2322 0x7820
/* Interrupt Routine Defines */
#define SERIAL_IIR_RLS 0x06
#define SERIAL_IIR_MS 0x00
/*
* Emulation of the bit mask on the LINE STATUS REGISTER.
*/
#define SERIAL_LSR_DR 0x0001
#define SERIAL_LSR_OE 0x0002
#define SERIAL_LSR_PE 0x0004
#define SERIAL_LSR_FE 0x0008
#define SERIAL_LSR_BI 0x0010
#define MOS_MSR_DELTA_CTS 0x10
#define MOS_MSR_DELTA_DSR 0x20
#define MOS_MSR_DELTA_RI 0x40
#define MOS_MSR_DELTA_CD 0x80
/* Serial Port register Address */
#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
#define LINE_CONTROL_REGISTER ((__u16)(0x03))
#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
#define LINE_STATUS_REGISTER ((__u16)(0x05))
#define MODEM_STATUS_REGISTER ((__u16)(0x06))
#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
#define DIVISOR_LATCH_LSB ((__u16)(0x00))
#define DIVISOR_LATCH_MSB ((__u16)(0x01))
#define CLK_MULTI_REGISTER ((__u16)(0x02))
#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
#define GPIO_REGISTER ((__u16)(0x07))
#define SERIAL_LCR_DLAB ((__u16)(0x0080))
/*
* URB POOL related defines
*/
#define NUM_URBS 16 /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
static const struct usb_device_id moschip_port_id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
{} /* terminating entry */
};
static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
/* This structure holds all of the local port information */
struct moschip_port {
int port_num; /*Actual port number in the device(1,2,etc) */
struct urb *write_urb; /* write URB for this port */
struct urb *read_urb; /* read URB for this port */
struct urb *int_urb;
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
char open;
char open_ports;
char zombie;
wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
int delta_msr_cond;
struct async_icount icount;
struct usb_serial_port *port; /* loop back to the owner of this object */
/* Offsets */
__u8 SpRegOffset;
__u8 ControlRegOffset;
__u8 DcrRegOffset;
/* for processing control URBS in interrupt context */
struct urb *control_urb;
struct usb_ctrlrequest *dr;
char *ctrl_buf;
int MsrLsr;
spinlock_t pool_lock;
struct urb *write_urb_pool[NUM_URBS];
char busy[NUM_URBS];
bool read_urb_busy;
};
static bool debug;
/*
* mos7840_set_reg_sync
* To set the Control register by calling usb_fill_control_urb function
* by passing usb_sndctrlpipe function as parameter.
*/
static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
val = val & 0x00ff;
dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, val, reg, NULL, 0,
MOS_WDR_TIMEOUT);
}
/*
* mos7840_get_reg_sync
* To set the Uart register by calling usb_fill_control_urb function by
* passing usb_rcvctrlpipe function as parameter.
*/
static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 *val)
{
struct usb_device *dev = port->serial->dev;
int ret = 0;
u8 *buf;
buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
*val = buf[0];
dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
kfree(buf);
return ret;
}
/*
* mos7840_set_uart_reg
* To set the Uart register by calling usb_fill_control_urb function by
* passing usb_sndctrlpipe function as parameter.
*/
static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
val = val & 0x00ff;
/* For the UART control registers, the application number need
to be Or'ed */
if (port->serial->num_ports == 4) {
val |= (((__u16) port->number -
(__u16) (port->serial->minor)) + 1) << 8;
dbg("mos7840_set_uart_reg application number is %x", val);
} else {
if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
val |= (((__u16) port->number -
(__u16) (port->serial->minor)) + 1) << 8;
dbg("mos7840_set_uart_reg application number is %x",
val);
} else {
val |=
(((__u16) port->number -
(__u16) (port->serial->minor)) + 2) << 8;
dbg("mos7840_set_uart_reg application number is %x",
val);
}
}
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, val, reg, NULL, 0,
MOS_WDR_TIMEOUT);
}
/*
* mos7840_get_uart_reg
* To set the Control register by calling usb_fill_control_urb function
* by passing usb_rcvctrlpipe function as parameter.
*/
static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
__u16 *val)
{
struct usb_device *dev = port->serial->dev;
int ret = 0;
__u16 Wval;
u8 *buf;
buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* dbg("application number is %4x",
(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
/* Wval is same as application number */
if (port->serial->num_ports == 4) {
Wval =
(((__u16) port->number - (__u16) (port->serial->minor)) +
1) << 8;
dbg("mos7840_get_uart_reg application number is %x", Wval);
} else {
if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
Wval = (((__u16) port->number -
(__u16) (port->serial->minor)) + 1) << 8;
dbg("mos7840_get_uart_reg application number is %x",
Wval);
} else {
Wval = (((__u16) port->number -
(__u16) (port->serial->minor)) + 2) << 8;
dbg("mos7840_get_uart_reg application number is %x",
Wval);
}
}
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
*val = buf[0];
kfree(buf);
return ret;
}
static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
{
dbg("***************************************");
dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
dbg("***************************************");
}
/************************************************************************/
/************************************************************************/
/* I N T E R F A C E F U N C T I O N S */
/* I N T E R F A C E F U N C T I O N S */
/************************************************************************/
/************************************************************************/
static inline void mos7840_set_port_private(struct usb_serial_port *port,
struct moschip_port *data)
{
usb_set_serial_port_data(port, (void *)data);
}
static inline struct moschip_port *mos7840_get_port_private(struct
usb_serial_port
*port)
{
return (struct moschip_port *)usb_get_serial_port_data(port);
}
static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
struct moschip_port *mos7840_port;
struct async_icount *icount;
mos7840_port = port;
icount = &mos7840_port->icount;
if (new_msr &
(MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
MOS_MSR_DELTA_CD)) {
icount = &mos7840_port->icount;
/* update input line counters */
if (new_msr & MOS_MSR_DELTA_CTS) {
icount->cts++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_DSR) {
icount->dsr++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_CD) {
icount->dcd++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_RI) {
icount->rng++;
smp_wmb();
}
}
}
static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
struct async_icount *icount;
dbg("%s - %02x", __func__, new_lsr);
if (new_lsr & SERIAL_LSR_BI) {
/*
* Parity and Framing errors only count if they
* occur exclusive of a break being
* received.
*/
new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
}
/* update input line counters */
icount = &port->icount;
if (new_lsr & SERIAL_LSR_BI) {
icount->brk++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_OE) {
icount->overrun++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_PE) {
icount->parity++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_FE) {
icount->frame++;
smp_wmb();
}
}
/************************************************************************/
/************************************************************************/
/* U S B C A L L B A C K F U N C T I O N S */
/* U S B C A L L B A C K F U N C T I O N S */
/************************************************************************/
/************************************************************************/
static void mos7840_control_callback(struct urb *urb)
{
unsigned char *data;
struct moschip_port *mos7840_port;
__u8 regval = 0x0;
int result = 0;
int status = urb->status;
mos7840_port = urb->context;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __func__,
status);
return;
default:
dbg("%s - nonzero urb status received: %d", __func__,
status);
goto exit;
}
dbg("%s urb buffer size is %d", __func__, urb->actual_length);
dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
mos7840_port->MsrLsr, mos7840_port->port_num);
data = urb->transfer_buffer;
regval = (__u8) data[0];
dbg("%s data is %x", __func__, regval);
if (mos7840_port->MsrLsr == 0)
mos7840_handle_new_msr(mos7840_port, regval);
else if (mos7840_port->MsrLsr == 1)
mos7840_handle_new_lsr(mos7840_port, regval);
exit:
spin_lock(&mos7840_port->pool_lock);
if (!mos7840_port->zombie)
result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
spin_unlock(&mos7840_port->pool_lock);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__func__, result);
}
}
static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
__u16 *val)
{
struct usb_device *dev = mcs->port->serial->dev;
struct usb_ctrlrequest *dr = mcs->dr;
unsigned char *buffer = mcs->ctrl_buf;
int ret;
dr->bRequestType = MCS_RD_RTYPE;
dr->bRequest = MCS_RDREQ;
dr->wValue = cpu_to_le16(Wval); /* 0 */
dr->wIndex = cpu_to_le16(reg);
dr->wLength = cpu_to_le16(2);
usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
(unsigned char *)dr, buffer, 2,
mos7840_control_callback, mcs);
mcs->control_urb->transfer_buffer_length = 2;
ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
return ret;
}
/*****************************************************************************
* mos7840_interrupt_callback
* this is the callback function for when we have received data on the
* interrupt endpoint.
*****************************************************************************/
static void mos7840_interrupt_callback(struct urb *urb)
{
int result;
int length;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
__u16 Data;
unsigned char *data;
__u8 sp[5], st;
int i, rv = 0;
__u16 wval, wreg = 0;
int status = urb->status;
dbg("%s", " : Entering");
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __func__,
status);
return;
default:
dbg("%s - nonzero urb status received: %d", __func__,
status);
goto exit;
}
length = urb->actual_length;
data = urb->transfer_buffer;
serial = urb->context;
/* Moschip get 5 bytes
* Byte 1 IIR Port 1 (port.number is 0)
* Byte 2 IIR Port 2 (port.number is 1)
* Byte 3 IIR Port 3 (port.number is 2)
* Byte 4 IIR Port 4 (port.number is 3)
* Byte 5 FIFO status for both */
if (length && length > 5) {
dbg("%s", "Wrong data !!!");
return;
}
sp[0] = (__u8) data[0];
sp[1] = (__u8) data[1];
sp[2] = (__u8) data[2];
sp[3] = (__u8) data[3];
st = (__u8) data[4];
for (i = 0; i < serial->num_ports; i++) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
wval =
(((__u16) serial->port[i]->number -
(__u16) (serial->minor)) + 1) << 8;
if (mos7840_port->open) {
if (sp[i] & 0x01) {
dbg("SP%d No Interrupt !!!", i);
} else {
switch (sp[i] & 0x0f) {
case SERIAL_IIR_RLS:
dbg("Serial Port %d: Receiver status error or ", i);
dbg("address bit detected in 9-bit mode");
mos7840_port->MsrLsr = 1;
wreg = LINE_STATUS_REGISTER;
break;
case SERIAL_IIR_MS:
dbg("Serial Port %d: Modem status change", i);
mos7840_port->MsrLsr = 0;
wreg = MODEM_STATUS_REGISTER;
break;
}
spin_lock(&mos7840_port->pool_lock);
if (!mos7840_port->zombie) {
rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
} else {
spin_unlock(&mos7840_port->pool_lock);
return;
}
spin_unlock(&mos7840_port->pool_lock);
}
}
}
if (!(rv < 0))
/* the completion handler for the control urb will resubmit */
return;
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__func__, result);
}
}
static int mos7840_port_paranoia_check(struct usb_serial_port *port,
const char *function)
{
if (!port) {
dbg("%s - port == NULL", function);
return -1;
}
if (!port->serial) {
dbg("%s - port->serial == NULL", function);
return -1;
}
return 0;
}
/* Inline functions to check the sanity of a pointer that is passed to us */
static int mos7840_serial_paranoia_check(struct usb_serial *serial,
const char *function)
{
if (!serial) {
dbg("%s - serial == NULL", function);
return -1;
}
if (!serial->type) {
dbg("%s - serial->type == NULL!", function);
return -1;
}
return 0;
}
static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
const char *function)
{
/* if no port was specified, or it fails a paranoia check */
if (!port ||
mos7840_port_paranoia_check(port, function) ||
mos7840_serial_paranoia_check(port->serial, function)) {
/* then say that we don't have a valid usb_serial thing,
* which will end up genrating -ENODEV return values */
return NULL;
}
return port->serial;
}
/*****************************************************************************
* mos7840_bulk_in_callback
* this is the callback function for when we have received data on the
* bulk in endpoint.
*****************************************************************************/
static void mos7840_bulk_in_callback(struct urb *urb)
{
int retval;
unsigned char *data;
struct usb_serial *serial;
struct usb_serial_port *port;
struct moschip_port *mos7840_port;
struct tty_struct *tty;
int status = urb->status;
mos7840_port = urb->context;
if (!mos7840_port) {
dbg("%s", "NULL mos7840_port pointer");
return;
}
if (status) {
dbg("nonzero read bulk status received: %d", status);
mos7840_port->read_urb_busy = false;
return;
}
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Port Paranoia failed");
mos7840_port->read_urb_busy = false;
return;
}
serial = mos7840_get_usb_serial(port, __func__);
if (!serial) {
dbg("%s", "Bad serial pointer");
mos7840_port->read_urb_busy = false;
return;
}
dbg("%s", "Entering... ");
data = urb->transfer_buffer;
dbg("%s", "Entering ...........");
if (urb->actual_length) {
tty = tty_port_tty_get(&mos7840_port->port->port);
if (tty) {
tty_insert_flip_string(tty, data, urb->actual_length);
dbg(" %s ", data);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
mos7840_port->icount.rx += urb->actual_length;
smp_wmb();
dbg("mos7840_port->icount.rx is %d:",
mos7840_port->icount.rx);
}
if (!mos7840_port->read_urb) {
dbg("%s", "URB KILLED !!!");
mos7840_port->read_urb_busy = false;
return;
}
mos7840_port->read_urb_busy = true;
retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (retval) {
dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
mos7840_port->read_urb_busy = false;
}
}
/*****************************************************************************
* mos7840_bulk_out_data_callback
* this is the callback function for when we have finished sending
* serial data on the bulk out endpoint.
*****************************************************************************/
static void mos7840_bulk_out_data_callback(struct urb *urb)
{
struct moschip_port *mos7840_port;
struct tty_struct *tty;
int status = urb->status;
int i;
mos7840_port = urb->context;
spin_lock(&mos7840_port->pool_lock);
for (i = 0; i < NUM_URBS; i++) {
if (urb == mos7840_port->write_urb_pool[i]) {
mos7840_port->busy[i] = 0;
break;
}
}
spin_unlock(&mos7840_port->pool_lock);
if (status) {
dbg("nonzero write bulk status received:%d", status);
return;
}
if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
dbg("%s", "Port Paranoia failed");
return;
}
dbg("%s", "Entering .........");
tty = tty_port_tty_get(&mos7840_port->port->port);
if (tty && mos7840_port->open)
tty_wakeup(tty);
tty_kref_put(tty);
}
/************************************************************************/
/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
/************************************************************************/
#ifdef MCSSerialProbe
static int mos7840_serial_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
/*need to implement the mode_reg reading and updating\
structures usb_serial_ device_type\
(i.e num_ports, num_bulkin,bulkout etc) */
/* Also we can update the changes attach */
return 1;
}
#endif
/*****************************************************************************
* mos7840_open
* this function is called by the tty driver when a port is opened
* If successful, we return 0
* Otherwise we return a negative error number.
*****************************************************************************/
static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int response;
int j;
struct usb_serial *serial;
struct urb *urb;
__u16 Data;
int status;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
dbg ("%s enter", __func__);
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Port Paranoia failed");
return -ENODEV;
}
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__)) {
dbg("%s", "Serial Paranoia failed");
return -ENODEV;
}
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL || port0 == NULL)
return -ENODEV;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
port0->open_ports++;
/* Initialising the write urb pool */
for (j = 0; j < NUM_URBS; ++j) {
urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->write_urb_pool[j] = urb;
if (urb == NULL) {
dev_err(&port->dev, "No more urbs???\n");
continue;
}
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
GFP_KERNEL);
if (!urb->transfer_buffer) {
usb_free_urb(urb);
mos7840_port->write_urb_pool[j] = NULL;
dev_err(&port->dev,
"%s-out of memory for urb buffers.\n",
__func__);
continue;
}
}
/*****************************************************************************
* Initialize MCS7840 -- Write Init values to corresponding Registers
*
* Register Index
* 1 : IER
* 2 : FCR
* 3 : LCR
* 4 : MCR
*
* 0x08 : SP1/2 Control Reg
*****************************************************************************/
/* NEED to check the following Block */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
if (status < 0) {
dbg("Reading Spreg failed");
return -1;
}
Data |= 0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dbg("writing Spreg failed");
return -1;
}
Data &= ~0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dbg("writing Spreg failed");
return -1;
}
/* End of block to be checked */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
if (status < 0) {
dbg("Reading Controlreg failed");
return -1;
}
Data |= 0x08; /* Driver done bit */
Data |= 0x20; /* rx_disable */
status = mos7840_set_reg_sync(port,
mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dbg("writing Controlreg failed");
return -1;
}
/* do register settings here */
/* Set all regs to the device default values. */
/***********************************
* First Disable all interrupts.
***********************************/
Data = 0x00;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (status < 0) {
dbg("disabling interrupts failed");
return -1;
}
/* Set FIFO_CONTROL_REGISTER to the default value */
Data = 0x00;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed");
return -1;
}
Data = 0xcf;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed");
return -1;
}
Data = 0x03;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
Data = 0x0b;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
mos7840_port->shadowMCR = Data;
Data = 0x00;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
mos7840_port->shadowLCR = Data;
Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x0c;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
Data = 0x0;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
Data = 0x00;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
Data = Data & ~SERIAL_LCR_DLAB;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
/* clearing Bulkin and Bulkout Fifo */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
Data = Data | 0x0c;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
Data = Data & ~0x0c;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
/* Finally enable all interrupts */
Data = 0x0c;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
/* clearing rx_disable */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
Data = Data & ~0x20;
status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
Data);
/* rx_negate */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
Data = Data | 0x10;
status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
Data);
/* Check to see if we've set up our endpoint info yet *
* (can't set it up in mos7840_startup as the structures *
* were not set up at that time.) */
if (port0->open_ports == 1) {
if (serial->port[0]->interrupt_in_buffer == NULL) {
/* set up interrupt urb */
usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
serial->dev,
usb_rcvintpipe(serial->dev,
serial->port[0]->interrupt_in_endpointAddress),
serial->port[0]->interrupt_in_buffer,
serial->port[0]->interrupt_in_urb->
transfer_buffer_length,
mos7840_interrupt_callback,
serial,
serial->port[0]->interrupt_in_urb->interval);
/* start interrupt read for mos7840 *
* will continue as long as mos7840 is connected */
response =
usb_submit_urb(serial->port[0]->interrupt_in_urb,
GFP_KERNEL);
if (response) {
dev_err(&port->dev, "%s - Error %d submitting "
"interrupt urb\n", __func__, response);
}
}
}
/* see if we've set up our endpoint info yet *
* (can't set it up in mos7840_startup as the *
* structures were not set up at that time.) */
dbg("port number is %d", port->number);
dbg("serial number is %d", port->serial->minor);
dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
dbg("port's number in the device is %d", mos7840_port->port_num);
mos7840_port->read_urb = port->read_urb;
/* set up our bulk in urb */
if ((serial->num_ports == 2)
&& ((((__u16)port->number -
(__u16)(port->serial->minor)) % 2) != 0)) {
usb_fill_bulk_urb(mos7840_port->read_urb,
serial->dev,
usb_rcvbulkpipe(serial->dev,
(port->bulk_in_endpointAddress) + 2),
port->bulk_in_buffer,
mos7840_port->read_urb->transfer_buffer_length,
mos7840_bulk_in_callback, mos7840_port);
} else {
usb_fill_bulk_urb(mos7840_port->read_urb,
serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->bulk_in_buffer,
mos7840_port->read_urb->transfer_buffer_length,
mos7840_bulk_in_callback, mos7840_port);
}
dbg("mos7840_open: bulkin endpoint is %d",
port->bulk_in_endpointAddress);
mos7840_port->read_urb_busy = true;
response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
if (response) {
dev_err(&port->dev, "%s - Error %d submitting control urb\n",
__func__, response);
mos7840_port->read_urb_busy = false;
}
/* initialize our wait queues */
init_waitqueue_head(&mos7840_port->wait_chase);
init_waitqueue_head(&mos7840_port->delta_msr_wait);
/* initialize our icount structure */
memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
/* initialize our port settings */
/* Must set to enable ints! */
mos7840_port->shadowMCR = MCR_MASTER_IE;
/* send a open port command */
mos7840_port->open = 1;
/* mos7840_change_port_settings(mos7840_port,old_termios); */
mos7840_port->icount.tx = 0;
mos7840_port->icount.rx = 0;
dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
serial, mos7840_port, port);
dbg ("%s leave", __func__);
return 0;
}
/*****************************************************************************
* mos7840_chars_in_buffer
* this function is called by the tty driver when it wants to know how many
* bytes of data we currently have outstanding in the port (data that has
* been written, but hasn't made it out the port yet)
* If successful, we return the number of bytes left to be written in the
* system,
* Otherwise we return zero.
*****************************************************************************/
static int mos7840_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int i;
int chars = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s", " mos7840_chars_in_buffer:entering ...........");
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return 0;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s", "mos7840_break:leaving ...........");
return 0;
}
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i)
if (mos7840_port->busy[i])
chars += URB_TRANSFER_BUFFER_SIZE;
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
dbg("%s - returns %d", __func__, chars);
return chars;
}
/*****************************************************************************
* mos7840_close
* this function is called by the tty driver when a port is closed
*****************************************************************************/
static void mos7840_close(struct usb_serial_port *port)
{
struct usb_serial *serial;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
int j;
__u16 Data;
dbg("%s", "mos7840_close:entering...");
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Port Paranoia failed");
return;
}
serial = mos7840_get_usb_serial(port, __func__);
if (!serial) {
dbg("%s", "Serial Paranoia failed");
return;
}
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL || port0 == NULL)
return;
for (j = 0; j < NUM_URBS; ++j)
usb_kill_urb(mos7840_port->write_urb_pool[j]);
/* Freeing Write URBs */
for (j = 0; j < NUM_URBS; ++j) {
if (mos7840_port->write_urb_pool[j]) {
if (mos7840_port->write_urb_pool[j]->transfer_buffer)
kfree(mos7840_port->write_urb_pool[j]->
transfer_buffer);
usb_free_urb(mos7840_port->write_urb_pool[j]);
}
}
/* While closing port, shutdown all bulk read, write *
* and interrupt read if they exists */
if (serial->dev) {
if (mos7840_port->write_urb) {
dbg("%s", "Shutdown bulk write");
usb_kill_urb(mos7840_port->write_urb);
}
if (mos7840_port->read_urb) {
dbg("%s", "Shutdown bulk read");
usb_kill_urb(mos7840_port->read_urb);
mos7840_port->read_urb_busy = false;
}
if ((&mos7840_port->control_urb)) {
dbg("%s", "Shutdown control read");
/*/ usb_kill_urb (mos7840_port->control_urb); */
}
}
/* if(mos7840_port->ctrl_buf != NULL) */
/* kfree(mos7840_port->ctrl_buf); */
port0->open_ports--;
dbg("mos7840_num_open_ports in close%d:in port%d",
port0->open_ports, port->number);
if (port0->open_ports == 0) {
if (serial->port[0]->interrupt_in_urb) {
dbg("%s", "Shutdown interrupt_in_urb");
usb_kill_urb(serial->port[0]->interrupt_in_urb);
}
}
if (mos7840_port->write_urb) {
/* if this urb had a transfer buffer already (old tx) free it */
if (mos7840_port->write_urb->transfer_buffer != NULL)
kfree(mos7840_port->write_urb->transfer_buffer);
usb_free_urb(mos7840_port->write_urb);
}
Data = 0x0;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
Data = 0x00;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
mos7840_port->open = 0;
dbg("%s", "Leaving ............");
}
/************************************************************************
*
* mos7840_block_until_chase_response
*
* This function will block the close until one of the following:
* 1. Response to our Chase comes from mos7840
* 2. A timeout of 10 seconds without activity has expired
* (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
*
************************************************************************/
static void mos7840_block_until_chase_response(struct tty_struct *tty,
struct moschip_port *mos7840_port)
{
int timeout = 1 * HZ;
int wait = 10;
int count;
while (1) {
count = mos7840_chars_in_buffer(tty);
/* Check for Buffer status */
if (count <= 0)
return;
/* Block the thread for a while */
interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
timeout);
/* No activity.. count down section */
wait--;
if (wait == 0) {
dbg("%s - TIMEOUT", __func__);
return;
} else {
/* Reset timeout value back to seconds */
wait = 10;
}
}
}
/*****************************************************************************
* mos7840_break
* this function sends a break to the port
*****************************************************************************/
static void mos7840_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char data;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
dbg("%s", "Entering ...........");
dbg("mos7840_break: Start");
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Port Paranoia failed");
return;
}
serial = mos7840_get_usb_serial(port, __func__);
if (!serial) {
dbg("%s", "Serial Paranoia failed");
return;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (serial->dev)
/* flush and block until tx is empty */
mos7840_block_until_chase_response(tty, mos7840_port);
if (break_state == -1)
data = mos7840_port->shadowLCR | LCR_SET_BREAK;
else
data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
/* FIXME: no locking on shadowLCR anywhere in driver */
mos7840_port->shadowLCR = data;
dbg("mcs7840_break mos7840_port->shadowLCR is %x",
mos7840_port->shadowLCR);
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
mos7840_port->shadowLCR);
}
/*****************************************************************************
* mos7840_write_room
* this function is called by the tty driver when it wants to know how many
* bytes of data we can accept for a specific port.
* If successful, we return the amount of room that we have for this port
* Otherwise we return a negative error number.
*****************************************************************************/
static int mos7840_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int i;
int room = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s", " mos7840_write_room:entering ...........");
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
dbg("%s", " mos7840_write_room:leaving ...........");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s", "mos7840_break:leaving ...........");
return -1;
}
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (!mos7840_port->busy[i])
room += URB_TRANSFER_BUFFER_SIZE;
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
dbg("%s - returns %d", __func__, room);
return room;
}
/*****************************************************************************
* mos7840_write
* this function is called by the tty driver when data should be written to
* the port.
* If successful, we return the number of bytes written, otherwise we
* return a negative error number.
*****************************************************************************/
static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *data, int count)
{
int status;
int i;
int bytes_sent = 0;
int transfer_size;
unsigned long flags;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
struct urb *urb;
/* __u16 Data; */
const unsigned char *current_position = data;
unsigned char *data1;
dbg("%s", "entering ...........");
/* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
mos7840_port->shadowLCR); */
#ifdef NOTMOS7840
Data = 0x00;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
mos7840_port->shadowLCR = Data;
dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
dbg("mos7840_write: mos7840_port->shadowLCR is %x",
mos7840_port->shadowLCR);
/* Data = 0x03; */
/* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
/* mos7840_port->shadowLCR=Data;//Need to add later */
Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
/* Data = 0x0c; */
/* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
Data = 0x00;
status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
dbg("mos7840_write:DLL value is %x", Data);
Data = 0x0;
status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
dbg("mos7840_write:DLM value is %x", Data);
Data = Data & ~SERIAL_LCR_DLAB;
dbg("mos7840_write: mos7840_port->shadowLCR is %x",
mos7840_port->shadowLCR);
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
#endif
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Port Paranoia failed");
return -1;
}
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__)) {
dbg("%s", "Serial Paranoia failed");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s", "mos7840_port is NULL");
return -1;
}
/* try to find a free urb in the list */
urb = NULL;
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (!mos7840_port->busy[i]) {
mos7840_port->busy[i] = 1;
urb = mos7840_port->write_urb_pool[i];
dbg("URB:%d", i);
break;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
if (urb == NULL) {
dbg("%s - no more free urbs", __func__);
goto exit;
}
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (urb->transfer_buffer == NULL) {
dev_err_console(port, "%s no more kernel memory...\n",
__func__);
goto exit;
}
}
transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
memcpy(urb->transfer_buffer, current_position, transfer_size);
/* fill urb with data and submit */
if ((serial->num_ports == 2)
&& ((((__u16)port->number -
(__u16)(port->serial->minor)) % 2) != 0)) {
usb_fill_bulk_urb(urb,
serial->dev,
usb_sndbulkpipe(serial->dev,
(port->bulk_out_endpointAddress) + 2),
urb->transfer_buffer,
transfer_size,
mos7840_bulk_out_data_callback, mos7840_port);
} else {
usb_fill_bulk_urb(urb,
serial->dev,
usb_sndbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
urb->transfer_buffer,
transfer_size,
mos7840_bulk_out_data_callback, mos7840_port);
}
data1 = urb->transfer_buffer;
dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
mos7840_port->busy[i] = 0;
dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
"with status = %d\n", __func__, status);
bytes_sent = status;
goto exit;
}
bytes_sent = transfer_size;
mos7840_port->icount.tx += transfer_size;
smp_wmb();
dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
exit:
return bytes_sent;
}
/*****************************************************************************
* mos7840_throttle
* this function is called by the tty driver when it wants to stop the data
* being read from the port.
*****************************************************************************/
static void mos7840_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
int status;
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return;
}
dbg("- port %d", port->number);
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dbg("%s", "port not opened");
return;
}
dbg("%s", "Entering ..........");
/* if we are implementing XON/XOFF, send the stop character */
if (I_IXOFF(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
status = mos7840_write(tty, port, &stop_char, 1);
if (status <= 0)
return;
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
mos7840_port->shadowMCR &= ~MCR_RTS;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0)
return;
}
}
/*****************************************************************************
* mos7840_unthrottle
* this function is called by the tty driver when it wants to resume
* the data being read from the port (called after mos7840_throttle is
* called)
*****************************************************************************/
static void mos7840_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int status;
struct moschip_port *mos7840_port = mos7840_get_port_private(port);
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return;
}
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s", "Entering ..........");
/* if we are implementing XON/XOFF, send the start character */
if (I_IXOFF(tty)) {
unsigned char start_char = START_CHAR(tty);
status = mos7840_write(tty, port, &start_char, 1);
if (status <= 0)
return;
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
mos7840_port->shadowMCR |= MCR_RTS;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0)
return;
}
}
static int mos7840_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
unsigned int result;
__u16 msr;
__u16 mcr;
int status;
mos7840_port = mos7840_get_port_private(port);
dbg("%s - port %d", __func__, port->number);
if (mos7840_port == NULL)
return -ENODEV;
status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
| ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
| ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
| ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
| ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
| ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
| ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
dbg("%s - 0x%04X", __func__, result);
return result;
}
static int mos7840_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
unsigned int mcr;
int status;
dbg("%s - port %d", __func__, port->number);
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -ENODEV;
/* FIXME: What locks the port registers ? */
mcr = mos7840_port->shadowMCR;
if (clear & TIOCM_RTS)
mcr &= ~MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~MCR_DTR;
if (clear & TIOCM_LOOP)
mcr &= ~MCR_LOOPBACK;
if (set & TIOCM_RTS)
mcr |= MCR_RTS;
if (set & TIOCM_DTR)
mcr |= MCR_DTR;
if (set & TIOCM_LOOP)
mcr |= MCR_LOOPBACK;
mos7840_port->shadowMCR = mcr;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
if (status < 0) {
dbg("setting MODEM_CONTROL_REGISTER Failed");
return status;
}
return 0;
}
/*****************************************************************************
* mos7840_calc_baud_rate_divisor
* this function calculates the proper baud rate divisor for the specified
* baud rate.
*****************************************************************************/
static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
__u16 *clk_sel_val)
{
dbg("%s - %d", __func__, baudRate);
if (baudRate <= 115200) {
*divisor = 115200 / baudRate;
*clk_sel_val = 0x0;
}
if ((baudRate > 115200) && (baudRate <= 230400)) {
*divisor = 230400 / baudRate;
*clk_sel_val = 0x10;
} else if ((baudRate > 230400) && (baudRate <= 403200)) {
*divisor = 403200 / baudRate;
*clk_sel_val = 0x20;
} else if ((baudRate > 403200) && (baudRate <= 460800)) {
*divisor = 460800 / baudRate;
*clk_sel_val = 0x30;
} else if ((baudRate > 460800) && (baudRate <= 806400)) {
*divisor = 806400 / baudRate;
*clk_sel_val = 0x40;
} else if ((baudRate > 806400) && (baudRate <= 921600)) {
*divisor = 921600 / baudRate;
*clk_sel_val = 0x50;
} else if ((baudRate > 921600) && (baudRate <= 1572864)) {
*divisor = 1572864 / baudRate;
*clk_sel_val = 0x60;
} else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
*divisor = 3145728 / baudRate;
*clk_sel_val = 0x70;
}
return 0;
#ifdef NOTMCS7840
for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
if (mos7840_divisor_table[i].BaudRate == baudrate) {
*divisor = mos7840_divisor_table[i].Divisor;
return 0;
}
}
/* After trying for all the standard baud rates *
* Try calculating the divisor for this baud rate */
if (baudrate > 75 && baudrate < 230400) {
/* get the divisor */
custom = (__u16) (230400L / baudrate);
/* Check for round off */
round1 = (__u16) (2304000L / baudrate);
round = (__u16) (round1 - (custom * 10));
if (round > 4)
custom++;
*divisor = custom;
dbg(" Baud %d = %d", baudrate, custom);
return 0;
}
dbg("%s", " Baud calculation Failed...");
return -1;
#endif
}
/*****************************************************************************
* mos7840_send_cmd_write_baud_rate
* this function sends the proper command to change the baud rate of the
* specified port.
*****************************************************************************/
static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
int baudRate)
{
int divisor = 0;
int status;
__u16 Data;
unsigned char number;
__u16 clk_sel_val;
struct usb_serial_port *port;
if (mos7840_port == NULL)
return -1;
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return -1;
}
if (mos7840_serial_paranoia_check(port->serial, __func__)) {
dbg("%s", "Invalid Serial");
return -1;
}
dbg("%s", "Entering ..........");
number = mos7840_port->port->number - mos7840_port->port->serial->minor;
dbg("%s - port = %d, baud = %d", __func__,
mos7840_port->port->number, baudRate);
/* reset clk_uart_sel in spregOffset */
if (baudRate > 115200) {
#ifdef HW_flow_control
/* NOTE: need to see the pther register to modify */
/* setting h/w flow control bit to 1 */
Data = 0x2b;
mos7840_port->shadowMCR = Data;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud");
return -1;
}
#endif
} else {
#ifdef HW_flow_control
/* setting h/w flow control bit to 0 */
Data = 0xb;
mos7840_port->shadowMCR = Data;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud");
return -1;
}
#endif
}
if (1) { /* baudRate <= 115200) */
clk_sel_val = 0x0;
Data = 0x0;
status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
&clk_sel_val);
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
&Data);
if (status < 0) {
dbg("reading spreg failed in set_serial_baud");
return -1;
}
Data = (Data & 0x8f) | clk_sel_val;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud");
return -1;
}
/* Calculate the Divisor */
if (status) {
dev_err(&port->dev, "%s - bad baud rate\n", __func__);
return status;
}
/* Enable access to divisor latch */
Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
mos7840_port->shadowLCR = Data;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
/* Write the divisor */
Data = (unsigned char)(divisor & 0xff);
dbg("set_serial_baud Value to write DLL is %x", Data);
mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
Data = (unsigned char)((divisor & 0xff00) >> 8);
dbg("set_serial_baud Value to write DLM is %x", Data);
mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
/* Disable access to divisor latch */
Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
mos7840_port->shadowLCR = Data;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
}
return status;
}
/*****************************************************************************
* mos7840_change_port_settings
* This routine is called to set the UART on the device to match
* the specified new settings.
*****************************************************************************/
static void mos7840_change_port_settings(struct tty_struct *tty,
struct moschip_port *mos7840_port, struct ktermios *old_termios)
{
int baud;
unsigned cflag;
unsigned iflag;
__u8 lData;
__u8 lParity;
__u8 lStop;
int status;
__u16 Data;
struct usb_serial_port *port;
struct usb_serial *serial;
if (mos7840_port == NULL)
return;
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return;
}
if (mos7840_serial_paranoia_check(port->serial, __func__)) {
dbg("%s", "Invalid Serial");
return;
}
serial = port->serial;
dbg("%s - port %d", __func__, mos7840_port->port->number);
if (!mos7840_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s", "Entering ..........");
lData = LCR_BITS_8;
lStop = LCR_STOP_1;
lParity = LCR_PAR_NONE;
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/* Change the number of bits */
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5:
lData = LCR_BITS_5;
break;
case CS6:
lData = LCR_BITS_6;
break;
case CS7:
lData = LCR_BITS_7;
break;
default:
case CS8:
lData = LCR_BITS_8;
break;
}
}
/* Change the Parity bit */
if (cflag & PARENB) {
if (cflag & PARODD) {
lParity = LCR_PAR_ODD;
dbg("%s - parity = odd", __func__);
} else {
lParity = LCR_PAR_EVEN;
dbg("%s - parity = even", __func__);
}
} else {
dbg("%s - parity = none", __func__);
}
if (cflag & CMSPAR)
lParity = lParity | 0x20;
/* Change the Stop bit */
if (cflag & CSTOPB) {
lStop = LCR_STOP_2;
dbg("%s - stop bits = 2", __func__);
} else {
lStop = LCR_STOP_1;
dbg("%s - stop bits = 1", __func__);
}
/* Update the LCR with the correct value */
mos7840_port->shadowLCR &=
~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
mos7840_port->shadowLCR |= (lData | lParity | lStop);
dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
mos7840_port->shadowLCR);
/* Disable Interrupts */
Data = 0x00;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
Data = 0x00;
mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
Data = 0xcf;
mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
/* Send the updated LCR value to the mos7840 */
Data = mos7840_port->shadowLCR;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x00b;
mos7840_port->shadowMCR = Data;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
Data = 0x00b;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
/* set up the MCR register and send it to the mos7840 */
mos7840_port->shadowMCR = MCR_MASTER_IE;
if (cflag & CBAUD)
mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
if (cflag & CRTSCTS)
mos7840_port->shadowMCR |= (MCR_XON_ANY);
else
mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
Data = mos7840_port->shadowMCR;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(tty);
if (!baud) {
/* pick a default, any default... */
dbg("%s", "Picked default baud...");
baud = 9600;
}
dbg("%s - baud rate = %d", __func__, baud);
status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
/* Enable Interrupts */
Data = 0x0c;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (mos7840_port->read_urb_busy == false) {
mos7840_port->read_urb_busy = true;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (status) {
dbg("usb_submit_urb(read bulk) failed, status = %d",
status);
mos7840_port->read_urb_busy = false;
}
}
wake_up(&mos7840_port->delta_msr_wait);
mos7840_port->delta_msr_cond = 1;
dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
mos7840_port->shadowLCR);
}
/*****************************************************************************
* mos7840_set_termios
* this function is called by the tty driver when it wants to change
* the termios structure
*****************************************************************************/
static void mos7840_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
int status;
unsigned int cflag;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
dbg("mos7840_set_termios: START");
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return;
}
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__)) {
dbg("%s", "Invalid Serial");
return;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s", "setting termios - ");
cflag = tty->termios->c_cflag;
dbg("%s - clfag %08x iflag %08x", __func__,
tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
dbg("%s - old clfag %08x old iflag %08x", __func__,
old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
dbg("%s - port %d", __func__, port->number);
/* change the port settings to the new ones specified */
mos7840_change_port_settings(tty, mos7840_port, old_termios);
if (!mos7840_port->read_urb) {
dbg("%s", "URB KILLED !!!!!");
return;
}
if (mos7840_port->read_urb_busy == false) {
mos7840_port->read_urb_busy = true;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (status) {
dbg("usb_submit_urb(read bulk) failed, status = %d",
status);
mos7840_port->read_urb_busy = false;
}
}
}
/*****************************************************************************
* mos7840_get_lsr_info - get line status register info
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
* release the bus after transmitting. This must be done when
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
*****************************************************************************/
static int mos7840_get_lsr_info(struct tty_struct *tty,
unsigned int __user *value)
{
int count;
unsigned int result = 0;
count = mos7840_chars_in_buffer(tty);
if (count == 0) {
dbg("%s -- Empty", __func__);
result = TIOCSER_TEMT;
}
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
/*****************************************************************************
* mos7840_get_serial_info
* function to get information about serial port
*****************************************************************************/
static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
struct serial_struct __user *retinfo)
{
struct serial_struct tmp;
if (mos7840_port == NULL)
return -1;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = PORT_16550A;
tmp.line = mos7840_port->port->serial->minor;
tmp.port = mos7840_port->port->number;
tmp.irq = 0;
tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
tmp.baud_base = 9600;
tmp.close_delay = 5 * HZ;
tmp.closing_wait = 30 * HZ;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int mos7840_get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
struct async_icount cnow;
mos7840_port = mos7840_get_port_private(port);
cnow = mos7840_port->icount;
smp_rmb();
icount->cts = cnow.cts;
icount->dsr = cnow.dsr;
icount->rng = cnow.rng;
icount->dcd = cnow.dcd;
icount->rx = cnow.rx;
icount->tx = cnow.tx;
icount->frame = cnow.frame;
icount->overrun = cnow.overrun;
icount->parity = cnow.parity;
icount->brk = cnow.brk;
icount->buf_overrun = cnow.buf_overrun;
dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
port->number, icount->rx, icount->tx);
return 0;
}
/*****************************************************************************
* SerialIoctl
* this function handles any ioctl calls to the driver
*****************************************************************************/
static int mos7840_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
void __user *argp = (void __user *)arg;
struct moschip_port *mos7840_port;
struct async_icount cnow;
struct async_icount cprev;
if (mos7840_port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -1;
dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
switch (cmd) {
/* return number of bytes available */
case TIOCSERGETLSR:
dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
return mos7840_get_lsr_info(tty, argp);
case TIOCGSERIAL:
dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
return mos7840_get_serial_info(mos7840_port, argp);
case TIOCSSERIAL:
dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
break;
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
cprev = mos7840_port->icount;
while (1) {
/* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
mos7840_port->delta_msr_cond = 0;
wait_event_interruptible(mos7840_port->delta_msr_wait,
(mos7840_port->
delta_msr_cond == 1));
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
cnow = mos7840_port->icount;
smp_rmb();
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; /* no change => error */
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
return 0;
}
cprev = cnow;
}
/* NOTREACHED */
break;
default:
break;
}
return -ENOIOCTLCMD;
}
static int mos7840_calc_num_ports(struct usb_serial *serial)
{
__u16 Data = 0x00;
int ret = 0;
int mos7840_num_ports;
ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,
VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
if ((Data & 0x01) == 0) {
mos7840_num_ports = 2;
serial->num_bulk_in = 2;
serial->num_bulk_out = 2;
serial->num_ports = 2;
} else {
mos7840_num_ports = 4;
serial->num_bulk_in = 4;
serial->num_bulk_out = 4;
serial->num_ports = 4;
}
return mos7840_num_ports;
}
/****************************************************************************
* mos7840_startup
****************************************************************************/
static int mos7840_startup(struct usb_serial *serial)
{
struct moschip_port *mos7840_port;
struct usb_device *dev;
int i, status;
__u16 Data;
dbg("%s", "mos7840_startup :Entering..........");
if (!serial) {
dbg("%s", "Invalid Handler");
return -1;
}
dev = serial->dev;
dbg("%s", "Entering...");
dbg ("mos7840_startup: serial = %p", serial);
/* we set up the pointers to the endpoints in the mos7840_open *
* function, as the structures aren't created yet. */
/* set up port private structures */
for (i = 0; i < serial->num_ports; ++i) {
dbg ("mos7840_startup: configuring port %d............", i);
mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
if (mos7840_port == NULL) {
dev_err(&dev->dev, "%s - Out of memory\n", __func__);
status = -ENOMEM;
i--; /* don't follow NULL pointer cleaning up */
goto error;
}
/* Initialize all port interrupt end point to port 0 int
* endpoint. Our device has only one interrupt end point
* common to all port */
mos7840_port->port = serial->port[i];
mos7840_set_port_private(serial->port[i], mos7840_port);
spin_lock_init(&mos7840_port->pool_lock);
/* minor is not initialised until later by
* usb-serial.c:get_free_serial() and cannot therefore be used
* to index device instances */
mos7840_port->port_num = i + 1;
dbg ("serial->port[i]->number = %d", serial->port[i]->number);
dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
dbg ("serial->minor = %d", serial->minor);
if (mos7840_port->port_num == 1) {
mos7840_port->SpRegOffset = 0x0;
mos7840_port->ControlRegOffset = 0x1;
mos7840_port->DcrRegOffset = 0x4;
} else if ((mos7840_port->port_num == 2)
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0x8;
mos7840_port->ControlRegOffset = 0x9;
mos7840_port->DcrRegOffset = 0x16;
} else if ((mos7840_port->port_num == 2)
&& (serial->num_ports == 2)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 3)
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 4)
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xc;
mos7840_port->ControlRegOffset = 0xd;
mos7840_port->DcrRegOffset = 0x1c;
}
mos7840_dump_serial_port(mos7840_port);
mos7840_set_port_private(serial->port[i], mos7840_port);
/* enable rx_disable bit in control register */
status = mos7840_get_reg_sync(serial->port[i],
mos7840_port->ControlRegOffset, &Data);
if (status < 0) {
dbg("Reading ControlReg failed status-0x%x", status);
break;
} else
dbg("ControlReg Reading success val is %x, status%d",
Data, status);
Data |= 0x08; /* setting driver done bit */
Data |= 0x04; /* sp1_bit to have cts change reflect in
modem status reg */
/* Data |= 0x20; //rx_disable bit */
status = mos7840_set_reg_sync(serial->port[i],
mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
break;
} else
dbg("ControlReg Writing success(rx_disable) status%d",
status);
/* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
and 0x24 in DCR3 */
Data = 0x01;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset + 0), Data);
if (status < 0) {
dbg("Writing DCR0 failed status-0x%x", status);
break;
} else
dbg("DCR0 Writing success status%d", status);
Data = 0x05;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset + 1), Data);
if (status < 0) {
dbg("Writing DCR1 failed status-0x%x", status);
break;
} else
dbg("DCR1 Writing success status%d", status);
Data = 0x24;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset + 2), Data);
if (status < 0) {
dbg("Writing DCR2 failed status-0x%x", status);
break;
} else
dbg("DCR2 Writing success status%d", status);
/* write values in clkstart0x0 and clkmulti 0x20 */
Data = 0x0;
status = mos7840_set_reg_sync(serial->port[i],
CLK_START_VALUE_REGISTER, Data);
if (status < 0) {
dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
break;
} else
dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
Data = 0x20;
status = mos7840_set_reg_sync(serial->port[i],
CLK_MULTI_REGISTER, Data);
if (status < 0) {
dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
status);
goto error;
} else
dbg("CLK_MULTI_REGISTER Writing success status%d",
status);
/* write value 0x0 to scratchpad register */
Data = 0x00;
status = mos7840_set_uart_reg(serial->port[i],
SCRATCH_PAD_REGISTER, Data);
if (status < 0) {
dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
status);
break;
} else
dbg("SCRATCH_PAD_REGISTER Writing success status%d",
status);
/* Zero Length flag register */
if ((mos7840_port->port_num != 1)
&& (serial->num_ports == 2)) {
Data = 0xff;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (ZLP_REG1 +
((__u16)mos7840_port->port_num)), Data);
dbg("ZLIP offset %x",
(__u16) (ZLP_REG1 +
((__u16) mos7840_port->port_num)));
if (status < 0) {
dbg("Writing ZLP_REG%d failed status-0x%x",
i + 2, status);
break;
} else
dbg("ZLP_REG%d Writing success status%d",
i + 2, status);
} else {
Data = 0xff;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (ZLP_REG1 +
((__u16)mos7840_port->port_num) - 0x1), Data);
dbg("ZLIP offset %x",
(__u16) (ZLP_REG1 +
((__u16) mos7840_port->port_num) - 0x1));
if (status < 0) {
dbg("Writing ZLP_REG%d failed status-0x%x",
i + 1, status);
break;
} else
dbg("ZLP_REG%d Writing success status%d",
i + 1, status);
}
mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
GFP_KERNEL);
if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
!mos7840_port->dr) {
status = -ENOMEM;
goto error;
}
}
dbg ("mos7840_startup: all ports configured...........");
/* Zero Length flag enable */
Data = 0x0f;
status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
if (status < 0) {
dbg("Writing ZLP_REG5 failed status-0x%x", status);
goto error;
} else
dbg("ZLP_REG5 Writing success status%d", status);
/* setting configuration feature to one */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
(__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
return 0;
error:
for (/* nothing */; i >= 0; i--) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
kfree(mos7840_port->dr);
kfree(mos7840_port->ctrl_buf);
usb_free_urb(mos7840_port->control_urb);
kfree(mos7840_port);
serial->port[i] = NULL;
}
return status;
}
/****************************************************************************
* mos7840_disconnect
* This function is called whenever the device is removed from the usb bus.
****************************************************************************/
static void mos7840_disconnect(struct usb_serial *serial)
{
int i;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s", " disconnect :entering..........");
if (!serial) {
dbg("%s", "Invalid Handler");
return;
}
/* check for the ports to be closed,close the ports and disconnect */
/* free private structure allocated for serial port *
* stop reads and writes on all ports */
for (i = 0; i < serial->num_ports; ++i) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
dbg ("mos7840_port %d = %p", i, mos7840_port);
if (mos7840_port) {
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
mos7840_port->zombie = 1;
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
usb_kill_urb(mos7840_port->control_urb);
}
}
dbg("%s", "Thank u :: ");
}
/****************************************************************************
* mos7840_release
* This function is called when the usb_serial structure is freed.
****************************************************************************/
static void mos7840_release(struct usb_serial *serial)
{
int i;
struct moschip_port *mos7840_port;
dbg("%s", " release :entering..........");
if (!serial) {
dbg("%s", "Invalid Handler");
return;
}
/* check for the ports to be closed,close the ports and disconnect */
/* free private structure allocated for serial port *
* stop reads and writes on all ports */
for (i = 0; i < serial->num_ports; ++i) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
dbg("mos7840_port %d = %p", i, mos7840_port);
if (mos7840_port) {
kfree(mos7840_port->ctrl_buf);
kfree(mos7840_port->dr);
kfree(mos7840_port);
}
}
dbg("%s", "Thank u :: ");
}
static struct usb_driver io_driver = {
.name = "mos7840",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = moschip_id_table_combined,
};
static struct usb_serial_driver moschip7840_4port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "mos7840",
},
.description = DRIVER_DESC,
.id_table = moschip_port_id_table,
.num_ports = 4,
.open = mos7840_open,
.close = mos7840_close,
.write = mos7840_write,
.write_room = mos7840_write_room,
.chars_in_buffer = mos7840_chars_in_buffer,
.throttle = mos7840_throttle,
.unthrottle = mos7840_unthrottle,
.calc_num_ports = mos7840_calc_num_ports,
#ifdef MCSSerialProbe
.probe = mos7840_serial_probe,
#endif
.ioctl = mos7840_ioctl,
.set_termios = mos7840_set_termios,
.break_ctl = mos7840_break,
.tiocmget = mos7840_tiocmget,
.tiocmset = mos7840_tiocmset,
.get_icount = mos7840_get_icount,
.attach = mos7840_startup,
.disconnect = mos7840_disconnect,
.release = mos7840_release,
.read_bulk_callback = mos7840_bulk_in_callback,
.read_int_callback = mos7840_interrupt_callback,
};
static struct usb_serial_driver * const serial_drivers[] = {
&moschip7840_4port_device, NULL
};
module_usb_serial_driver(io_driver, serial_drivers);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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